chore: tsdown dual build #6637

Job	Run time
Format check	42s
Unit tests (ubuntu-latest)	48s
Unit tests (macos-latest)	1m 5s
Build	1m 28s
E2E tests (ubuntu-latest)	2m 39s
Linter	1m 43s
E2E tests (macos-latest)	2m 30s
Unit tests (windows-latest)	1m 36s
E2E tests (windows-latest)	3m 37s
Integration tests (macos-latest)	55s
Integration tests (ubuntu-latest)	47s
Integration tests (windows-latest)	1m 42s
	19m 32s

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